Configuring the RF Signal
R&S
®
SMW200A
530User Manual 1175.6632.02 ─ 30
The instrument provides the following internal modulation signal sources:
●
An LF generator
●
A multifunction generator and a noise generator
●
A high performance pulse generator
The R&S SMW generates both the carrier (LF) and RF frequencies, provides sine or
square waves, waveforms with rising and falling edges (triangle, sawtooth and trape-
zoid), and various noise signals, such as a white noise with selectable bandwidth and
level distribution.
To configure and perform a modulation, you need to select the LF modulation signal
source, configure the LF signal, and determine the settings of the modulation.
See the following sections for detailed information:
●
Modulation Signals describes the characteristics of the available modulation signal
sources, and provides access to the RF Connectors Settings.
●
Modulation Signal Waveforms shows the waveform shapes and their respective
parameters graphically.
●
Modulation Settings contains the settings for the AM, FM, PhiM and Pulse modula-
tion.
●
Output Settings enables you to select the signal for output, and to specify the
amplitude and an offset.
Interactions and characteristics
●
Some modulations exclude each other and cannot be performed simultaneously.
●
For instruments equipped with R&S SMW-B2031/-B2044(N), amplitude modula-
tion, frequency modulation and phase modulation are only possible in RF path A.
When activating frequency or phase modulation in RF path A, the R&S SMW turns
off signal generation in RF path B.
●
For pulse modulated signals, you can select between fast or smoothed transitions,
see "Transition Type" on page 541.
This setting is available over the entire frequency range for all instruments with fre-
quency options up to 6 GHz. For higher frequency options, the frequency range for
the smoothed setting is limited.
For more information, see data sheet.
●
The settings of the modulation signal affect all analog modulations that use an
internal modulation source.
●
In sweep mode, LF frequency sweep is possible.
●
You can feed an external LF signal in each of the two paths.
●
An activated analog modulation automatically turns off:
– I/Q modulation
– Arbitrary waveform generation
– Digital modulation
– Digital standards
Analog Modulations
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